Electric heater



N Mde1 C, W. DREW C E. R. FRANCIS.

ELECTRIC HEATER. No. 426,437. Patented Apr. 29,1890.

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UNITED STATES PATENT OFFICE.

CHARLES IV. DREV AND EDIVARD R. FRANCIS, OF MINNEAPOLIS, MINNESOTA.

ELECTRIC -H EATER.

SPECIFICATION forming part of Letters Patent No. 426,43*?, dated April29, 1890.

Application filed February 20, 189()- Serial No. 341,178. (No model.)

.T @ZZ whom it may concern:

Be it known that we, CHARLES W. DREW and EDWARD R. FRANCIS, ofMinneapolis, in the county of Hennepin and State of Minnesota, haveinvented-certain Improvements in Electric Heaters, of which thefollowing is a specification.

The object of this invention is to provide improvedlneans for utilizingan electric current for heating purposes.

The invention consists, generally, in providing a series of coils ofresistant wire or metal supported upon strips or supports having asurface of insulating material and arranged Within a suitable casingupon a base .of electric insulating and non-heat-conducting materialwith a heating-plate arranged over but not in contact with said coils.

The invention consists, further, in thc construction and combinationhereinafter described, and particularly pointed out in the claims.

In the accompanying drawings, forming a part of this specification,Figure l is a plan view ot our heater', with a portion of the upperplate broken away. Fig. 2 is a transverse section on line 0c of Fig. l.,with the plate in position.

In the drawings, 2 represents a suitable casing, having a lining 3 ofelectric insulating and non -heat conducting material, which forms abase upon which are supported the portions of the heater that arearranged Within the casing. secured upon said base, is a frame-workconsisting of a series of rods 5 ot electrical insulating material, orhaving the surface covered or coated with an electrical insulatingmaterial. These rods are supported in suitable bearing-s 7, that restupon the base 3 and hold said rods above said base. An

electric-resistance materialpreferably in the Vithin this casing, and

form of a wire or strip S, is wound upon said rods extending spirallyalong one rod, then across to the next rod, and along that, and so onthroughout the series. The ends ofthe wire are adapted to be connectedto suitable conductors, through which the electric current is conductedto the heater.

Arranged over the coils of wire, and preferably in closeproximitythereto, is a heatingplate l1, which is adapted to be heated bythe heat radiated from the coils of resistant metal. The coils oit'resistant material arc supported upon the insulated surface-rods, so ias to be kept separated t'roln each other and from the heating-plate.

lThe material forming the coil may be of any desired width and Wound inany desired form.

Ie claim as our inventionl. The combination, in an electric heater, of asuitable casing, an electric insulating and non-heat-conducting basearranged therein, supports having an insulating-surface arranged uponsaid base, coils of electric-resistance material, arranged upon saidsupports, and a heating-plate arranged over said coils, substantially asdescribed.

2. The combination, in an electric heater, of a suitable casing, anelectric insulating and non-heat-conducting base arranged therein, rodshaving an insulated surface supported upon said base, and coils ofelectric-resistance material, supported upon said rods, substantially asdescribed.

` In testimony whereof we have hereunto set our hands this th day ofFebruary, 1890.

CHARLES W. DREW. EDWARD R. FRANCIS.

In presence of- A. M. GAsKILL, S. W. ROBERTS.

